Electronics > Beginners
Why are spectrum analyzers so expensive?
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ejeffrey:
I haven't looked at the behavior specifically of YIG spheres, but in other non-linear optics (like an EOM) the normal requirement is that you need a crystal that does not have inversion symmetry in order to get a second order non-linearity.  In that case your output field is proportional to (input field x control field) (aka a bilinear response -- linear in two different fields).  This has a straightforward analogy in non-linear circuits: if you have an analog circuit with symmetric clipping diodes you get only third order non-linearity (and higher odd orders).  You need an asymmetric circuit to get even order distortion.

If you have an inversion symmetric crystal you only get 3rd order non-linearity which usually means adjustment is quadratic in the applied field, which tends to require much larger tuning fields.
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